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Ca(OH)2 + H2SO4= CaSO4+H2O

Fe(OH)3 + HCl = FeCl3 +H2O

AlCl3 +NaOH = Al(OH)3+ Na Cl

NaOH+CO2 = Na2Co3 +H2O 

Ca(OH)2 + H2SO4= CaSO4+2H2O

Fe(OH)3 +3HCl = FeCl3 +3H2O

AlCl3 +3NaOH = Al(OH)3+ 3Na Cl

2NaOH+CO2 = Na2Co3 +H2O